如何使用JavaScript来阻止浏览器后退按钮 [英] how to stop browser back button using javascript
问题描述
我在PHP做网上测验应用程序。我想限制的用户，而在考试回去。
我曾尝试下面的脚本，但是它停止我的定时器。
我该怎么办，请给我建议。
我已经包括源$ C $ C。
计时器被存储在cdtimer.js
I am doing online quiz app in php. I want to restrict user while going back in exam. I have tried following script but it stops my timer. What should I do please suggest me. I have included source code. The timer is stored in cdtimer.js
<script type="text/javascript">
window.history.forward();
function noBack()
{
window.history.forward();
}
</script>
<body onLoad="noBack();" onpageshow="if (event.persisted) noBack();" onUnload="">
我有考试计时器这需要考试持续时间从的 MySQL数据库的，并相应启动定时器停止，当我把code禁用后退按钮。会有什么问题。
I have exam timer which takes duration of exam from mysql db and starts timer accordingly it stops when I put code for disabling back button. what will be the problem.
推荐答案
有为什么禁用后退按钮将无法真正工作的原因很多。最好的办法是警告用户：
There are numerous reasons why disabling the back button will not really work. Your best bet is to warn the user:
window.onbeforeunload = function() { return "You work will be lost."; };
此页列出了一些方法，你的可能的尝试禁用后退按钮，但没有保证：
This page does list a number of ways you could try to disable the back button, but none are guaranteed:
http://www.irt.org/script/311.htm
这篇关于如何使用JavaScript来阻止浏览器后退按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
